Punch and die mounting



' Aug, 7, 1945. F. K. KIRSCH 2,381,062

PUNCH AND DIE MOUNTING Filed Jun so, 1943 3 Sheets-Shea; 1

INVENTOR Frank K. Kirsch ATTORNEYS Aug. 7, 1945, F. K. KIRSCH 2,381,062

PUNCH AND DIE MOUNTING Filed June 30, 1943 3 Sheets-Sheet 2 4 4/ 59 In T: 67 I f! 69 7/ 2 l H 75 /7/ E99 I, w 55 I v lP-4 v i E4977 1 I I I" /97 mm INVENTOR Fran/r K/(z'rsch ATTORNEYS F. K. KlRscl-l 2,381,062

PUNCH AND DIE MOUNTING Filed June 30, 1943 3 Sfiets-Sheet 3 M- HEIL I m s r v I v P INVENTOR Frank K. Kirsch ATTORNEYS Patented 7, 1945 UNITED STATES PA E 'rf o -F ca rtmcnsnp ma Momma Frank K. Kirsch, ea-ea, Mien, mi or to Wales-Strippit corporation, North Tonawanda,

ApplicationJune so, mals'en i No. 402,791 20 Claims. (01. 1134-89) This invention relates to improvements in mounting punch and die implements or die sets. One of the objects of this invention'is to'brovide an improved method and means for mounting punch and die implements on dis sets so that I any set of implements can be quickly and accurately mounted on any die set. It is also an object of this invention to provide method and means oi' this kind by means of which punch and die implements can be properly mounted on a die set without requiring the services of an expert die setter. It is a further object to provide a method and means or this kind which may be standardized to make it die implements or apparatus on any number of different die sets by using holes already formed in the die set. 1 A filrther object is to provide apparatus of improved construction, by means ofv which mounting plates having punches and dies mounted thereon can readily be accurately located and secured to the punch holder and die shoe of a die set. A further object is to provide die sets with accurately formed and positioned holes, each having a locating bushing and a securing bushing pressed therein, for cooperation with bolts having separate locating and securing. Portions formed thereon. It is also an object of this in-' possible to assemble punch and -Fig.5 isaplanviewofthedieshoeofalarge die set showing a standardised spacing of holes and mounting plates of three diiferent sizes in position thereon.

Fig. 8 is a perspective view of a pair of mounting plates which will exactly ilt over any four locating holes of the die set shown in the m ll r left-handportion of Fig. 5.

Fig. 'l is a perspective view of a pair oi. mounting plates which will exactly as over any four locating holes as shown in the lower left-hand portion of Fig. 5.

Fig. 8 is a perspective view of a pair of mounting plates which will exactly fit over "any four locating holes-as shown in the right-hand portion of Fig; 5 and having two other holes for holding screws where necessary.

I punchis in axial alinement with its die d Fig. 9 is a fragmentary front view, partly in section, of a standardized die set having punch and die plates mounted thereon so that cacti; the accuracy of the spacings oi the holes through which the attachment bolts enter.

Fig. I0 is a similar view of the same die set, as shown in Fig. 9. and showing'how blanking dies may be quickly and accurately mounted thereon by using the same accurately spaced locating holes, as shown in Fig. 9.

vention to provide means of improved construction for .piugsing holes in the die set which are. not used and which mightinterfere with the proper functioning of the punch'or dieunits. j

Further obiects and advantages or this invention will appear from the following description and claims.

In the accompanying drawings:

Fig. 1 is a perspective view or a large conven- 'tional die set showing standardized locating holes formed in accordance with my invention and positioned in pairs one directly above the other. 1

Fig. 2 is a fragmentary cross sectional view of the upper part of a die set showing bushings for the accommodation of the bolts for attaching mounting Fig. 3'13 a similar fragmentary cross sectional view. showing an attachment guided'in its bushing to maintain accuracy in relation to other like bolts andtoitsmountin plate.

Fig. 41s a perspective view of a die set for use.

-portion ofthediesetshowninl'igl.

. plates and atthe same timeassur ing their accurate positioning on same.

- raised position.

Fig. 11 is a similar view of the same die set as Fig. 9 and'showing how the "Die set and templet mounting" shown in Patent No, 2,275,-

' 706 maybe used in this apparatus.

Fig. 12 is a front elevation, partly-in section, of a standardized die set mounted in a press 4 which is only partially ,showif, the die set having punch and die implements mounted thereon, the punch holder of the press being shown in Fig. 13 is a sectional plan view. on line I'l-Jfl, Fig. 12, showing a die carrier mounting plate .in position on a die shoe.

Fig'. 14 is asectional view showing the filler plug used to provide a flush surface over mounting holeswhen punch or die elements may be located in position over them, the section being takenonline |4--I-M,Fig.l3. I

lnthe particular die set shown in Fig. 1, it represents the die shoe, .II the punch holder, I! the guide posts, and ii the guide post bushing, all of-which parts when assembled are known as v. a die set." Die sets of this nature are a standdie sets are required for the basic mounts for punch and implements for Blanldng, punch mg, forming, drawing and other operations on sheet metal, they have heretofore always been supplied (except in special cases) with the main a,ss1,oc2 I or upper member ll of the me set, which Heretofore each die maker or designer provided means according to his own ideas for securing the punch and die to the die set and each time that a punch and die was mounted on a die set, an expert die setter was required to mount the punch and die in correct relation to each other. 'In order to overcome this difllculty, I provide each 'die set with a series. of holes which are formed accurately with their axes perpendicular to the faces of the die shoe and punch holder of the die set and arranged in accurately predetermined spaced relation to each other, and

-arranged with each hole of the punch holder in accurate axial alinement with a hole in the die shoe. .1 also adopta standard spacing of these holes, so that other diesets will have holes similarly spaced. I then provide the punch and die mounting plates, on which the punch and die implements are mounted, with holes which are spaced relatively to each other in' the same manholes are formed in axial alinement with correspondingly spaced holes II in the die shoe ll.

These holes may,'for example. be spaced at distances of six inches from each other so as to accommodate a plate somewhat larger than six inches square. Any suitable dimensions may. of

course, be selected. I have also provided two additional series or holes I. in the punch holder' H, which may be spaced in any suitable or desired relationship to the holes ll preferably in alinement therewith so that these holes I. may

accommodate a punch supporting plate of larger dimensions. The die shoe ll is-provided with holes II in axial 'alinement'with the holes ii.

In Fig. 4, I have shown a small diast having a die shoe 22, a punch holder 2|, and guide posts 22., In this small die set, the punch holder is -p vided with holes 22 arranged in axial alinent with holes 24 of the die set and these holes may be spaced in the same relationship to each other as the holes 14 and I! of the larger die set .shown in Fig. l. The die set shown in Fig. 4 is provided with a stem or projection 28 by means ner as the holes in the die set, and the punch and die implements are mounted on these mounting plates, so that they will cooperate correctly- -with each other whenthe holes of the plates are in axial alinement. Consequently, when these mounting ,plates with the punch' and die imple-' a ments thereon are to be placed on a die set, it is merely necessary to place accurately fitting pins into atleast two holes erpunch mounting plate and punch holder, and to place at least two accurately fitting pins into corresponding holes of I the die mounting plate and die shoe. The plates may then be secured to the'die set, and it will be obvious thatxwhen so mounted, the die implerhents will be correctly located with reference to the punch implements. Furthermore, if I die sets of. a shop or of' a number of shops are .ing of holes in thedie sets, then any set of plates rovided with holes identically spaced, and all die.

of which the punch holder may be mounted on the ram of the press in the .usual manner.

In Fig. 5, I have shown the die shoe 2' of the larger die set in which the holes are formed and spaced to accommodate die mounting plates of diilerent sizes. For example, the die set is provided with holes to support a diemountlns plate 22 of the smallest size in the upper lefthand corner thereof, and another die mounting plate II of larger size is arranged in the lower left corner, the die shoe. having holes suitable for accommodating these two plates. At the right-hand side of Fig. 5, a still larger die mounting plate II is shown which has holes in its corners arranged for cooperation with corresponding holes of the die shoe and intermediate or these holes, .additionallocating or securing means may be provided for holding the die mounting plate may be easily and quickly secured to a die set without the aid of a skilled die setter and without removing the die set from the press, so that the press will be idle only for a minimum intervaloftime.

Any suitable ordesiredarrangement o! aimin: holes may be employed. For example, the holes may be arranged at the intersections of straight lines equally spaced and extending lengthwise and crosswise of the die set, the crosswise ing tpmy invention,

- in correct relationon the die shoe 28. It will be noted that the holes shown in Fig. 5 are soarranged in the die shoe that in place of the three die mounting plates 2!, l0 and II shown in this figure, a single large plate covering. substantially the usable area of the die shoe could be used and the holes provided for the small plates could be employed for fitting large plates to the die shoe.

Also two plates of the size or plate II could be mounted on the die shoe. Since the spacing of the holes in any die on the part of the die designer toselect punch and die mounting plates having the holes therein lines exten'dingat 90..degrees from thelongitudinal lines. By adopting a standard spacing of these lines from each otheribotlnfor the die. sets andthe mounting plates, any set of mounting plates may be secured.to any die set, providin that the same is large enough, or an'umber of sets or smallmou'nting plates may be mounted at the .same time in a larger die set. These mounting plates may thenbe produced in quan- -tities with holes bored therein according to the standard adapted. The larger -die sets can have the holes therein spaced to'accommodate sev-- eral sets of smaller mounting plates and when large mounting plates are used thereon, preferably the same holes which serve for the smaller plates are also used for the larger plates. Inthe diev set shown in Fig. l, I have provided a middle-series of. holes il in the punch holder located to. cooperate with holes in the die set and to arrange these punch and die units on these plates so that they will cooperate with each other.

In Fig. 6; I have shown a punch mountingplate u for cooperation with the die mounting plate 2|, these plates being of the smallest sizeysuitable for use on a die set. such as shownin Fig.

4,'or for use with the openings l4 and" of the die set-shown in Fig. 1, or for use on a larger die set, as indicated in Fig. 5. In Fig.7, I have shown a larger size of mounting plates, the punch mounting plate ll being arranged for cooperation with a die mounting plate 30 similar to that shown in the lower left corner oi. Fig. 5.

In Fig. 8, I have shown the die mounting 'plate ll 'of Fig. 5 arranged to be used in conjunction with a punch mounting plate II. In

these plates, in addition to the corner holes, I

have shown intermediate holes it which may be t is made standard accord-,

ere will be no difllculty punch and diemounting plates may be used in conjunction with accurately machined pins for locating the mounting plates in correct relation asenoec to the die set and other suitable means may be provided for. securing the mounting plates in their correct positions. It is possible, however, to

combine the supporting means for the mounting plates with the locating means for these'plates. I haveillustrate'd this type of arrangement in Figs. 2 and 3, in which I have also shown two bushings in each hole of the die set. In these ligures, 39 represents the punch holder or upper member of the die set, and 40 represents one 01 the locating holes accurately formed in the punch holder. I preferably provide bushings for the locating holes, and in the construction shown in Figs. 2 and 3, I provide a locating bushing 4| having a smooth or cylindricalinner surface for cooperating with the locating pin, and a securing bushing 42, which may for example hav a threaded inner surface 43. The securing bushing 42, in theconstruction shown, is provided with a head or outwardly flaring flange portion- 44 which limits the extent to which the bushing may enter into the hole 40, and suitable means Y may be provided for preventing the turning of the bushing 42 in the hole 40 ofthe punch hold- ,er, such for example as a dowel or pin 45. which acts as a key between the securing bushing 42 and the punch holder 39.

The bushing 4| may cooperate with any'suitable alining or locating means for locating a ,punchmounting plate 46, Fig. 3, on the die set,

and the securing bushing 42 may cooperatewith suitable means for securing the punch mounting plate 46 in its correct position. The locating means may be a separate part from the securingmeans. In the construction illustrated in Fig. 3, I have provided a bolt which incorporates both of these means, the bolt having a stem or shank 48 which is accurately machined so as to have a case, the construction employed would be identical with that shown in Figs. 2 and 3, but in- .verted. It will also be obviousthat the bushings 4| and 42 may be omitted and the locating and securing holes may be formed directly in the punch holder and die shoe of the die set.

In Fig. 9, I have shown how the mounting plates with the punch and die implements mounted thereon may be secured to a die set by means of my improved construction. In this figure, 55 represents a punch mounting plate having a plurality of punch units applied thereto, each punch unit including a stripper sleeve 68 slidably arranged in an accurately formed hole in the punch mounting plate, a punch 51 extending into the stripper sleeve 56 and above it into contact with the punch holder 39 of the die set, and a stripper spring 58 interposed between'the head of the punch and a flange at the upper end of the stripper sleeve 51. When the work is being penetrated during the movement of the punch holder 39 toward the die shoe 62, the stripper sleeves 56 slide upwardly in their .-holes in the punch mountingplate 55 while the punch penetrates the work. 60 represents the die mounting plate which has dies 6| pressed into accurately formed holesin the plate 60, the lower ends of the dies resting directly on the die shoe 62 of thedie set.

- are provided with accurately formed locating holes therein, spaced according to the standard spacing adopted for the die sets, and in the construction shown, these holes in the two support.- ing plates may be provided with bushings '63. The diemounting plate 60 is secured to the die shoe 82 by means 01 a bolt similar to the one described in connection with Fig. 3, having an accurately formed cylindrical body portion or shank 04 which when inserted through the bushing 63 a of the die mounting plate and the locating bushsnug fit within the locating bushing and in a correspondingly accurately formed hole in the punch mounting plate 46. The bolt also has an end portion 49 or reduced diameter which is threaded to cooperate with the threaded securing bushing 42. represents a spacer which may be of any suitable or desired form, for example. in the form of a sleeve extending about the shank portion 43 of the bolt or in the form or a rail arranged between bolts, or the spacing means may be in the form 01' a series of blocks positioned to space the mounting plate 46 indefinite parallel spaced relation to the punch holder 39 of the die set. The bolt shown is provided with a head 5|, by means of which it may be turned.

It willbe obvious from the foregoing that the shank portion 48 of the bolt will position the punch mounting plate 46 so that the hole therein will be coaxial with the locating bushing 4| and by tightening the bolt, the punch mounting plate 48 will be securel held in this relationship. It is, 01 course, well known to those skilled in the ing 4| of the die shoe will ensure accurate posi- I tioning of the die mounting plate 60 on the die set. so that the plate may then be secured in this position by means of the crew-threaded portion of the bolt bushing 42. In the case of the punch mounting plate 55, because of, the height of the punching units above this plate, I have provided another form of spacing member, this spacing member also serving to aline or locate the punch mounting plate and is in effect an extension of the locating This-extension or spacing which cooperates with the threaded cylindrical locating portion 6! adapted to. cooperate with the locating bushing 4| in the punch holder or the die set and a screw-threaded portion 68 which serves to secure this spacing member to the securing bushing 42 of the diefiset.

' This spacing member includes a spacing part 89 art that screw threads cannot be relied upon to support a bolt coaxial with a hole, but by means or thelocating bushing and the accurately .iormed shank tained. Obviously, the same construction shown in Figs.- 2 and 3 may be used on a die shoe for securing a die mounting plate thereto, in which 48 of thebolt, a high degree of accuracy in mounting the plate 48 can be at-' of larger diameter than the cylindrical portion 81 and which preferably has a hexagonal or other. non-circular exterior surface so that it can be readily turned by means of a wrench. This portion is of the exact length required between'the lower surface of the punch holder 39 of the. die set and the upper suriace of the punch mounting plate 55,-against which the lower end of the ameterwhich is screw-threaded. This spacing member is adapted to cooperate with a bolt similar to those described and having an accurately machined cylindrical shank portion is fitting into the cylindrical portion I of the bore of the extension member and adapted to fit accurately in the bushing 63 of the punch mounting plate. The end of this bolt is of reduced diameter 'and threaded to cooperate with the threaded portion Not the extension or spacing member. It will be obvious that by dint positioning the spacing member into fixed relation to the punch holder 39 of the die set and then using the bolt for securing the punch mountin plate thereto. the bolt will be in correct axial alinement with the spacing member, and consequently, the hole in the bushing 63 ofthe punch mounting plate 55 will be in correct axial alinement with the bushing H in the punch holder 39. Since this bushing is in correct axial alinement with the corresponding bushing ll of the die shoe, it will be obvious that the various punching units mounted on the. punch mounting plate 55 will be in correct axialalinement with the dies 6| of the die mounting plate 60. 1

In Fig. 10, I have shown the same die set having diiferent mounting plates secured thereto. In this case, a mounting plate 15 is provided having a blanking punch 16 secured thereto and the die mounting plate 11 has a blanking die 18 mounted thereon. The holes in the two mounting plates for "receiving the locating and securin bolts connecting them to the die set are spaced identically as in the case of the mounting plates 55 and 60 shown in Fig. 9, and consequently, when it is desired to mount the blanking dies on the same die set, it is merely necessary to remove the bolts that secure the mounting plate 55 to the spacer member 69 and remove the punch mounting plate 55 and put in'its place the plate Ii. Since the distance between these plates will be less than in the case of the plates 55 and 00,

spacer members 00 of any suitable kind, such for example as the spacing members 00 shown in Fig. 9, or the sleeves 50 shown in Fig. 3, may be used to position the die mounting plate 'Il in spaced relation to the die shoe 82. These spacing case between the template and the parts or the die set. v

Figs. 12 and 13 show a complete die set with perforating apparatus mounted thereon and ready for operation in a press. In this die set, the punch holder 02, Fig. 12, is secured to the ram 03 of the press by means of bolts 84 which extend through flanges of the punch holder of the set, and the die shoe 05 is secured to the bolster plate 96 which in turn is'secured to the bed 01 of the ress. punch units mounted thereon similar to those shown in Fig. 9 is secured to the punch holder 92 of the die set in the same manner as heretofore described, by means of bolts 00, and the die mounting plate MI is secured to the bolster plate by means of shorter bolts I02, these bolts of both plates cooperating with locating bushings and securing bushings arranged in holes of the die shoe. The die mounting plate |0l on which the die units are mountedmay also support a' pair oi posts I04 having locating pins I00 thereon which are adapted to enter into preformed holes in the work for locating the work with reference to the punches and dies.

In Figs. 9 to 12, the additional holes in the die set for accommodating mounting plates of other sizes are omitted for the sake of clarity, but it will be understood that the die sets shown in these figures are provided with holes for accommodating mounting plates of various sires. Additional holes I01 for a smaller die plate are shown in broken lines in Fig. 13.

It may happen thatwith a plurality of locating holes in the die set. some of the punch or die members are preferably employed so that the blanks 84 punched out by the die may be readily removed. Ifdesired, the spacer members used in connection with the mounting plates may be made of such height that any set or mountin plates may operate with the same shut-height of the press, thereby further simplifying the changes over from one set of mounting plates to another by eliminating the need for-adjusting the bed or the press.

The blanking punch 10 and the die 10 are, of course, correctly mounted on the plates II and II with respect to the locating holes in these plates and secured to their mounting plates in any usual or suitable-manner, for example, by means of rivets 02 as shown inithe drawing. In thecase of any of the mounting plates. ii strains are placedon the plates, such as might cause them to deflect, additional spacing members 00, such as rails or blocks may be placed between the die mounting plate l1 and the die shoe 6! and similar spacing members 06 may alsobe interposed between the punch mounting plate 1"- aridthe .punch holder." or the die set.

disclosed in the patents issued to George F. Wales, Nos. 2,168,877 and 2,275,706, the apparatus shown in thedrawing being similar to that shown the blanking punch and die may be units may be located under or over these locating holes and thus interfere with the proper operation of these punch and die units. For this purpose, I provide plugs for the holes, such for example as are shown in Fig. 14. These plugs I" have body portions or shanks which are preferably of the samelength as the locating bushings ll and have threaded portions Ill ofreduced diameter which engage the threads of the bushings 42. The

ends. of these plugs preieraibly terminate flush with the surfaces of the punch holder or die shoe of the die set and these ends may be provided with slots .for a screwdriver. Any other means for tem orarily plugging any of the locating holes in the die set may be provided.

By means oi the foregoingmethod and apparatus, it will be obvious that the securing of mounting plates on the die sets is greatly facilitated so that the work or an expert die setter is entirely eliminated. Furthermore, by provid-' ing the mountingfplates with locating holesitherein arranged according to a certain predetermined spacing, various sizes of plates may be mounted on the die sets without requiring anychanges in the die sets themselves. Furthermore, the

mounting plates may be used in connection with any die set that ls'"provided with the locating holes in predetermined spaced relation to each other, regardless or where such die sets may be located. Consequently, the mountinl mm; may be interchangeably used, notonly on any die set of a particular-shop, but on dis sets of different The punch mounting plate I00 having that a standard shut-height may be adopted, or a series of standard shut-heights tor different Jobs,

so that it even becomes unnecessary to adjust.

the bed of the press-when of mounting plates to another. Furthermore, the .same die sets may be used for various types of dies, regardless of whether they are punching dies, blanking dies, or any other type of dies.

I claim as my invention:

l. A method of mounting pairs of punch and die plates of various sizes on a die set, which includes accurately forming in the punch holder and die shoe of a die set a plurality of groups of round locating holes, the holes of each group 01 a pat tern beingspaced at accurate uniform distances from each other, forming in each of said punch and die plates locating holes spaced from each other in identical spaced relationship with at least one group of locating-holes in said die set and arranged so that whensaid holes of the punch plate are in axial alinement with the holes in the die plate, the punches and dies on said plates will also 'be in axial alinement, and mounting said plates on said die set with the hole of said plates in axial alinement with the'selected group or holes of said die set.

2. A method of mounting pairs of punch and changing from one set die sets, forming v 4 5 holes in the punch holders and die shoes or said locating holes in each pair of plates accurately spaced to match one or more groups of holes in said punchholder and die shoe,

mounting punch and die implements on a pairl5 "mounting plate of the same pair, and spacing said mounting plates relatively to the punch holder and die shoe oi' the die set so that each set of mounting plates with their punch and'die implements requires the same shut-height of the press.

5. Means for punching sheet material, including a plurality of die sets each having a series of groups of round locating holes accurately formed in the punch holders anddie shoes thereof in predetermined spaced relation to each other, each hole in a punch holder being in axial alinement with a hole in the die shoe of a die set, a plurality of pairs of mounting plates having locating holes accuratelyiormed therein and spaced from each other in accordance with the spacing of at die plates of vvarious sizes on a die set, which v includes accurately forming in the punch holder and die shoe of a die set a plurality ofgroups of round locating holes, the holes in each, group said punch and die plates locating holes spaced from each other in identical spaced relationship with at least one group of locating holes in said die set and arranged so that when said,holes of the punch plate are in axial alinement with the holes in the die plate, the punches and dies on said plates will also be in axial alinement, passing accurately formed pins through the holes of said punch plate and into the selected group of cooperating holes of said punch holder, passing other accurately formed pins through the holes of said die plate and into the corresponding selected group of cooperating holes of said die shoe,- and then securing said punch and die plates to said punch holder and die shoe respectively.

a 3. A method oi mounting pairs of punch and die carrying plates of various sizes interchangeably on a plurality of die sets which comprises accurately i'orming like groups. of locating holes in ,the punch holders and die shoes of said the sets,

forming locating holes in each pair of plates accurately spaced to match one or more groups oi holes in said punch holder and die shoe, mounting punch and die implements on a pair of said mounting plates for cooperation with each other while the locating holes thereof are m coaxial least one group of said locating Holes of said die sets, securing-punch and die units on said mounting plates with the punch unitsoi' one plate of each pair arranged for cooperation with the die u 5 units of the other plate of the pair when the of a pattern beingspaced at accurate uniform distances from each other, forming in each of predetermined spaced relation to each other.:

each hole in a punch holder being in axial alineof at least one group of said locating holes of said ment with a hole in the die shoe or a die set, a plurality oi pairs of mounting plates having locating holes accurately to ed therein and spaced from each other in accordance with the spacing die sets, securing punch and die units on said mounting plates with the punch units of one plate v of each pair arranged for cooperation with the die units of the other plate ofthe pair when the locating holes of the pair are in axial alinement,

0 their alined positions;-

and combinedmeans for alining the locating holes of any pair of mounting plates with any corresponding group or holes in any of said die sets and for securing '1. Means for punching sheet material, including a p r lity of die sets each' having a series of loeating holes'accurately formed in the punch alinement, and then securing said mounting plates on any one of said die sets with said locating holes of said mounting-plates coaxial with the 05 spaced relation punch holderbeing in axial alinement witha hole inthe die shoe of a die set, a plurality oi selected group of locating holes in the-chosen .d e set whereby said punch implements on one of-sald mounting plates will be positioned for cooperation with the die implements on the other mounting plate of the same pair. f

.4. A method of mounting pairs of punch and die "carrying plates of various sizes interchangeably on a plurality of die sets which includes accurately forming like groups of round locating i0 other in accordance with the spacing holders and die shoes thereof in predetermined to each v other; each hdle in a pairs of mounting plates having locating holes accurately formed therein and spaced from each of at least some of said locating holes of said die sets, securing punch and die units on said mountin plates with the punch units oft-one plate of each pair arranged for cooperation with the dievunits said plates on a die set in 01' the other plate of the pair when the locating holes of the pair are in axial alinement, and bolts having accurately formed'shank portions for alining the locating holes of any pair of mounting plates with corresponding holes in any of said die sets and having threaded end portions for securingsaid plates to said die set with the locating holes of said plates and die set in alinement.

8. A die set 'for use with mounting plates of various sizes having punch and die units mounted thereon, said die set having a plurality of groups of accurately formed alined pairs of round holes arranged in the punch holder and in the die shoe of said die 'set, which groups of holes are arranged inaccurate predetermined spaced re- 5 lation to each other and the holes of each groupbeing in accurate predetermined spaced relation to other holes of the same group and, corresponding to' the spacing of locating holes in said mounting plates, and accurately formed cylinn drical parts formed to fit into a group of holes of a die set and of a mounting plate to aline said holes and means on said cylindrical parts to secure same in said holes.

9. A die set for use with mounting plates hav ing punch and die units mounted thereon, said die set having a plurality of groups of accurately formed alined pairs of holes arranged in the punch holder and in the die shoe of said die set, which groups of holes are arranged in accurate predetermined spaced relation to each other and the holes of each group being in accurate predetermined spaced relation to other holes of the same group, each of said holes having a pair of bushings therein, one bushing having a cylindrical bore therein for alining a,.hole in a mounting plate therewith, and the other bushing being formed to cooperate with means for securing a mounting plate to the die set.

die shoeof a die set, which pairs-of holes are arranged inaccurate predetermined spaced relation to each other, corresponding to the spacing of locating holes in said mounting plates, each of said holes in said die set having a pair of bushings therein, the bushing adjacent to the mounting plate having a cylindrical bore therein for alining a hole in a mounting plate therewith,

. and the other bushing being of smaller diameter v and having an internal screw thread, and bolts for alining the holes of said mounting plates with said first mentioned bushings and for securing said mounting plates to said second mentioned bushings, saidbolts having accurately formed cylindrical shank portions, each formed to extend through a hole of a mounting plate and said first mentioned bushing for alining said hole with the bore of said bushing, said bolt also having an outer screw-threaded end for cooperation with said screw-threaded bushing.

13. A die set mounting according to claim 12 and having spacing members interposed between a mounting plate and the die set.

14. A die set mounting according to claim 12 and having spacing sleeves arranged about said bolts for spacing said mounting plate from the,

part of the die set to which it is secured.

15. A die set having a locating hole therein provided with a pair of bushings, one of said bushings having a cylindrical inner surface and the other bushing being of smaller diameter and having an internal screw thread, a spacing memher having a cylindrical portion adapted to fit into the cylindrical bore of said first mentioned bushing and a threaded portion adapted to engage the internal thread of said other bushing,

said spacing member having a cylindrical bore in the f opposite end portion thereof and having a cylindrical bore of smaller diameter with an in- 10. A die set for use with mounting plates hav- 4 ternal screw thread arranged inwardly with refing punch and die units mounted thereon, said die set having a plurality of accurately formed alined pairs of holes arranged one in the punch holder and one in the die shoe of said die set, which pairs of holes are arranged in accurate 4d predetermined spaced relation to each other, each of said holes having a pair of bushingstherein one bushing having a cylindrical bore therein for alining a hole in a mounting plate therewith, and

the other bushing being formed to cooperate with means for securing a mounting plate to the die set, being provided with a smaller internal diameter and screw threaded.

11. A die set for use with mounting plates having punch and die units mounted thereon, said I die set having'a plurality of accurately formed alined pairs of holes arranged one in th punch holder and one in the die shoe of said die set; which pairs of holes are arranged in accurate pre-. determined spaced relation to each other, each of 00 said holes of said die set having a pair of bushings therein, one bushing having a cylindrical bore and being arranged in the portion of the hole nearest to the mounting plate to be secured thereto, and the other bushing having an interd6 nal screw thread, means for holding said other bushing against rotation in said hole, and means for holding said other bushing from endwise movement in said hole toward said first mentioned bushing.

12. The combination of a die set for use with mounting plates having punch and die units mounted thereon, said die 's'et having a plurality of accurately formed alined pairs of holes arranged one in th punch holder and one in the -13 erence to said'cylindrical bore, and a bolt adapted to cooperate With said spacing member and having a cylindrical shank portion for cooperation with the cylindrical portion of the bore of said spacing member and a threaded end portion for engagement with the threaded bore of said spacing member.

16. A die set for use with mounting plates having punch and die units mounted thereon. said die' set having a plurality of accurately formed alined pairs of holes arranged 0ne in the punch holder and one in the die shoe of said die set,

said pairs of holes being arranged in accurate predetermined spaced relation to each other for cooperation with corresponding locating holes of a plurality.of mounting plates of diiferent sizes, each hole having the portion thereof adjacent to the mounting plate provided with a cylindrical bore and the portion thereof remote from the mounting plateprovided with a bore of smaller diameter and internally screw-threaded.

- 17. A die set for use with mounting plates.

having punch and die units mounted thereon, said die set having a plurality of accurately formed alined-pairs of holes arranged one in the punch holder and one in the die shoe or said die set, said pairs of holes being arranged in curate predetermined spaced relation to each other for cooperation with corresponding locating holes of a plurality of mounting plates of different sizes, each hole having the portion thereof adjacent to the mounting plate provided with a cylindrical bore and the portion thereof remote from the mounting plate provided with a bore of smaller diameter and internally screw-threaded.

and a plug for said hole including a body portion formed to fit into the cylindrical portion of said hole and coextensive in length therewith and having a threaded end portion adapted to cooperate with the threaded portion of said hole.

18. A method of mounting pairs of punch and die carrying plates of various sizes interchangeable on a plurality of die sets which includes accurately forming like groups of round locating holes, according to a standard pattern, in the punch holders and die shoes of said die sets, forming locating holes in each pair of plates accurately spaced to match one or more groups of holes of said standard pattern in said punch holder and die shoe, mounting punch and die implements on .a pair of said mounting plates for cooperation with each other. while the locating holes thereof are in coaxial alinement, and then securing said mounting plates on any one of said die sets with said locating holes of said mounting plates coaxial with the selected group of locatin holes in the chosen die set whereby said punch implements on one of said mounting plates will be positioned for cooperationwith the die implements on the other mounting plate of the same pair.

19. A method of mounting multiple pairs of punch and die carrying plates of various sizes interchangeably on a plurality of die sets which includes accurately forming like groups of round locating holes in the punch holders and die shoes post, said post projecting away from the face of said punch holder and at its outer end being provided with hearing, locating and fastening-means by which said plate may be located and secured in spaced relation .tosaid punch holder face.

22. In a die set for use in a stamping press a punch plate mounting, comprising a plurality of of said die sets, forming locating holes in-each pair of plates accurately spaced to match one or more groups of holes in said punch holders and die shoes, mounting punch and die implements on two or more pairs of said mounting plates for cooperation witheach other while the locating holes of each pair are in coaxial alinement, and then securing [two or more pairs of said mounting plates on a die set with said holes of said mounting plates coaxial with the selected group of holes in said die set whereby said punch implements of each pair of mountin plates will be positioned for cooperation with the die implements of the other mounting plate of the same 20. A method of mounting pairs of punch and die carrying plates of various sizes on a die set, which includes accurately forming in the punch holder and die shoe of a die set a. plurality of groups of locating holes, the holes in each group of a pattern being spaced at accurate uniform distances from each other, forming in each of said punch and die plates locating holes spaced from each other in identical spaced relationship with at least one group of locating holes in said die set and arranged so that when said holes of the punch plate'are in axiakalinement with the holes in the die plate the punches and dies on said plates will also be in axial alinement, and mounting said plates on said die set with the holes of said plates in axial alinement with the selected group of holes of said die set, and means for plugging, in said punch holder and die shoe, the

unused holes covered by said plates to provide a bushings accommodating the locating element of 4 a; plate supporting post and the other bushing accommodating the fastening element of said holes in the punch holder of said die set, each of said holes being arranged Ito accommodate the locating and fastening elements of a plate supporting post which projects away from theface of said punch holder and ,is provided with bear ing locating and fastening means by which said plate may be located and secured in spaced relation to said punch holder face.

23. In a die set for use in a stamping press a punch plate mounting, comprising ,a plurality of holes in the punch holder of said die set, each of said holes being arranged to accommodate the locating andfastening elements of a plate supporting post which projects away from the face of said punch holder and is provided with bearing locating and fastening means by which said plate may be located and secured in spaced relation to said punch holder face, and means for plugging, in said punch holder, the unused holes covered by said plates, to provide a substantially solid base for backing up punch implements carried by said plate.

24. A method of mounting punch and die carrying plates on a die set, which comprises accurately forming locating and fastening holes in the punch holder and die shoe of said die set, mounting locating and supporting means, by said holes, to said punch holder and die shoe and then mounting said punch and die carrying plates on said supporting means, in spaced relation to the faces of said punch holder and said die shoe,

in such manner that the punch implements on the die implements the faces of said punch holder and said die shoe and inserting additional supporting means between said plates and said faces as desired, in such manner that .the punch implements on the one plate cooperate with the die implements on the other plate, said additional supporting means preventing said plates from deflecting.

26. A method of mounting punch and die carrying plates on a die set at variable spacings from the faces of .the punch holder and die shoe of said die set which includes accurately forming locating and fastening holes in said punch holder and die shoe in such manner 'that said plates having identically spaced holes are located and secured directly to said faces'by means cooperating with said holes, with thepunch and die elements in proper position to cooperate, and when these plates are'removed, spacer and supporting elements are interposed between said .faces and ,other punch and die carrying plates, 

